Thanks for your explanation. The only thing I can think of is a centralized system, where verifying entities give you a timerestricted certificate against some payment (since real value payments is probably the only thing a robot can not fake).
Then platforms can request you to need to be verified by a certain verifier in order to allow you to rate (lets take the example of verified ratings online).
Or when coming to digital services, that I can only give a review to a driver I have a confirmed ride which is payed. Like this the verification is by the driver himself. This would work decentralized.